Zinc plating and PVF coating steel tubes for automotive
High density zinc plating will increase durability of tube surface and chromate passivation will delay the white corrosion appear.Trivalent chromate (Cr+3)passivation is also available for environmental reqquirement.PVF coating quality shall give a high resistance againest corrosive conditions,Nickel and Zinc plating and double coating PVF or PVDF are developig to meeting for customers' high qualitu requirement.
Sorts of Surface Treatment
Electrolyte Zinc Plating+Chromate Yellow
Electrolyte Zinc Plating+Chromate Olive
Electrolyte Zinc Plating+Chromate Olibe+PVF Olive Green
PVF: Ply vinyl fluoride
Tubes coating
Tubes + Chromating +zinc plating +PVF coating
Technical Specification of External Surface Treatment
Treatment Layer | Thickness | Salt Spray Test (hours) | |
White Rust | Red rust | ||
Zinc | 8,13,25 | >70 | >192/240/280 |
Chromate | <3 | >72 | >192/240/280 |
PVF | >8,15,25 | >240 | >3000 |